Abstract: A housing system formed of a plurality of separate, preconstructed living units which housing system is characterized by a unique roof joint system wherein one of the adjacent living units comprises an overhanging casing protruding from and running along the length of its roof edge and the adjacent living unit comprises an uprising flange element extending along the length of its roof edge; and further characterized in that the roof edges of adjoining living units need not be equal in height and the length of any unit comprising the housing system need not be equal to the length of any other unit within the housing system. The present invention allows for a multitude of new and different housing designs for preformed, transportable homes.